by Yamiche Alcindor, USA TODAY

by Yamiche Alcindor, USA TODAY

FERGUSON, Mo. - For the second night in a row, this St. Louis suburb will be under a curfew in an attempt to calm the unrest that has plagued it for the last eight days. On Sunday, Missouri State Highway Patrol superintendent Col. Ron Replogle announced the curfew, which came as protesters and police continued to clash a week after the Aug. 9 fatal police shooting of Michael Brown, an unarmed 18-year-old, by officer Darren Wilson.

Seven people were arrested and one person was shot early Sunday as police and protesters clashed again in a haze of tear gas despite the curfew.

It was not clear who fired the shot, but Missouri Gov. Jay Nixon said no police officers fired their guns during or after the protest. He told CNN that the police "are trying to use the least amount of force to provide people the ability to speak, while also protecting the property of Ferguson."

Nixon didn't say when he foresaw the curfew ending or whether it would be extended further, but added, "We'd like to see it ratcheted down. What we'd like to see, that will be judged by the community." Nixon said he was "heartened" by people's response to the curfew early Sunday.

Anger has grown in recent days after police on Friday released a surveillance video purporting to show Brown stealing from a convenience store and roughing up its clerk about 15 minutes before the confrontation with Wilson.

"We were unaware they were going to release it, and we certainly were not happy with that being released," Nixon told ABC's This Week on Sunday. "It appeared to cast aspersions on a young man that was gunned down in the street. It made emotions raw."

Also on Sunday, the Justice Department said it would arrange for an another, "independent" autopsy of Brown's body "due to the extraordinary circumstances involved in this case and at the request of the Brown family."

The St. Louis County Medical Examiner's autopsy concluded that Brown died of gunshot wounds, but other details have not been released.